"""Part D — READ-ONLY watch of a demo box's real automatic night. Every 60 s until the box's update-leg summary AND its whole-guest backup outcome are both in (or a hard stop time): the controller's night lines (off-site leg, update leg, quiesce gate deferrals and runs, update events) and the agent's backup lines, appended to the evidence file. Touches nothing on the box. Usage: python3 d_watch.py